Selective Out‐of‐Plane Optical Coupling between Vertical and Planar Microrings in a 3D Configuration
Selective Out‐of‐Plane Optical Coupling between Vertical and Planar Microrings in a 3D Configuration
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DOI：
10.1002/adom.202000782
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发表时间：
2020-09
影响因子：
9
通讯作者：
S. Valligatla;Jiawei Wang;A. Madani;Ehsan Saei Ghareh Naz;Qi Hao;C. N. Saggau;Yin Yin-Yin;Libo Ma;O. Schmidt
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文献类型：
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作者：
S. Valligatla;Jiawei Wang;A. Madani;Ehsan Saei Ghareh Naz;Qi Hao;C. N. Saggau;Yin Yin-Yin;Libo Ma;O. Schmidt
三维光子集成电路有望在未来的光电子学中发挥关键作用，在光子层之间实现高效的信号传输。在这里，我们探索了管状微腔的光学耦合，它支持垂直平面上的共振，具有平面微细，容纳面内共振。在这种腔尺寸失配较大的三维耦合复合系统中，由于模式选择相互作用，观察到周期性的模式分裂和共振模式漂移。微管腔体的轴向为选择模耦合提供了额外的设计自由度，这是通过仔细调整微管和微环之间的轴向位移来实现的。光谱抗腐蚀行为是由这种复合光学系统中的强耦合引起的，并通过数值模拟很好地再现了这一行为。将管状微腔与平面微米连接是一种在3D光子系统中增加光学功能的层间光传输的很有前途的方法。
3D photonic integrated circuits are expected to play a key role in future optoelectronics with efficient signal transfer between photonic layers. Here, the optical coupling of tubular microcavities, supporting resonances in a vertical plane, with planar microrings, accommodating in‐plane resonances, is explored. In such a 3D coupled composite system with largely mismatched cavity sizes, periodic mode splitting and resonant mode shifts are observed due to mode‐selective interactions. The axial direction of the microtube cavity provides additional design freedom for selective mode coupling, which is achieved by carefully adjusting the axial displacement between the microtube and the microring. The spectral anticrossing behavior is caused by strong coupling in this composite optical system and is excellently reproduced by numerical modeling. Interfacing tubular microcavities with planar microrings is a promising approach toward interlayer light transfer with added optical functionality in 3D photonic systems.